Ever wonder what your VIN number stands for?? ... check out these links
   · 73-78 Chevy/GMC
  
· 79-80 Chevy/GMC
   ·
81-87 Chevy/GMC
These are pretty accurate as far as info goes, but it is educational purposes only!
The 3 illustrations came from:
 www.chuckschevytruckpages.com